Aircraft throttle control device including a cam coupling

1. An aeroengine control device comprising:

a mount, having pivotally mounted thereon a code wheel together with a main lever and a secondary lever, both for turning the code wheel, each lever being movable between a rest position and a maximum actuation position, the secondary lever being mounted to pivot on the main lever, and

sensors for sensing the angular position of the code wheel being mounted on the mount in register with an outline of the code wheel,

wherein a first cam path is formed on a part secured to the code wheel and a second cam path is formed on a part secured to the mount, the two cam paths having respective facing portions in which there is received a finger that is mounted on the main lever to slide parallel to the code wheel, with a connecting rod permanently connecting the finger to the secondary lever, and wherein the cam paths are arranged in such a manner that the main lever can move the code wheel when the main lever is moved while the secondary lever is in its rest position, and the secondary lever can move the code wheel when the secondary lever is moved while the main lever is in its rest position, with movement of either lever being prevented when the other lever is away from its rest position.

2. The device according to claim 1 , wherein the main lever pivots about the axis of the code wheel and the second cam path includes a first segment that is circularly arcuate about the axis of the code wheel, being of a radius that is determined to allow the main lever to pivot while keeping the secondary lever in the rest position, and a rectilinear second segment extending in a direction that is adapted to allow the secondary lever to move while keeping the main lever in the rest position.

3. The device according to claim 2 , wherein the second cam path includes a ramp between the first segment and the second segment, which ramp defines a transition zone in the vicinity of the rest position by acting on the finger in such a manner that when a first one of the levers is in the transition zone, moving the other lever towards its maximum actuation position causes the first lever to return to its rest position.

4. The device according to claim 2 , wherein the first cam path has a first segment arranged to cause the code wheel to pivot when the finger is driven by the secondary lever being moved between its two positions, the first segment having a shape selected from the following group:

rectilinear, forming an angle relative to a radial direction of the code wheel; and

curved, with its concave side facing towards the pivot axis of the code wheel.

5. The device according to claim 4 , wherein the first cam path has a second segment extending radially from a vicinity of the periphery of the code wheel to the first segment.

6. The device according to claim 1 , wherein the finger slides in a radial direction of the code wheel.

7. The device according to claim 1 , wherein the finger slides in a direction forming an angle relative to the radial direction of the code wheel.

8. The device according to claim 1 , wherein the main lever has two side plates between which the secondary lever and the connecting rod are mounted.